Published by rich on
Saturday, August 9, 2008 - 21:37:10
- Filed under Other Fun Stuff
Lame old scratching post:
Buster kept knocking over his old scratching post - then shredding various corners (especially the ones with wood trim) around my house.
I figured I’d make him a new one out of scrap wood.
He seems to like stretching out and scratching high. The new post is about 30 inches tall - as high as the highest scratch marks I could find.
I don’t think he’ll be able to tip this one over.
The new “Buster Post”:
As a bonus - I think it looks a lot nicer than the old post.
Published by rich on
Saturday, July 26, 2008 - 19:00:04
- Filed under Robots and Electronics, Other Fun Stuff
I’ve mentioned previously how much I like Pololu’s Baby Orangutan AVR Atmega-based robot controllers.
I use them pretty much exclusively in all my robotics and other electronics projects.
Specifically - they’ve saved me an untold number of hours in my ongoing translational drift / melty brain combat robotics effort.
You get a whole bunch of stuff packed into a tiny 1.2” x 0.7” board. In fact, for many projects you won’t need any additional circuitry besides sensors, motors and other goodies.
First - why Atmel?
- Pretty popular with hobbyists - so there’s lots of info out there
- WinAVR provides a decent free C development environment
- BascomAVR provides a free (size limited) basic compiler demo - or you can buy the full version for $120 (this is what I generally use)
(Yes, I’m a big fan of basic. For better or worse, it’s actually what the SpamButcher spam blocker program is written in.)
Pololu recently updated the Baby Organgutan. I haven’t sampled the new version yet - but the changes are pretty straight-forward including an upgraded voltage regulator and motor controllers.
Here’s what you get for $29.95 ($24.95 for an Atmega48 4k version):
- ATmega168 AVR microcontroller (16k flash, 1K RAM)
- ISP programming port
- Voltage regulator (5v to 13.5v input)
- Dual motor drivers (now good for 1 amp / channel continuous)
- Potentiometer
- 2 LEDs (one power, one user controlled)
- 20 MHZ crystal
- Additional support circuitry that helps to prevent brownouts and provide accurate analog readings
Those last two items are more important than I was really aware of. I hit a lot of problems with a board I recently designed because I failed to include all the right capacitors, coils and resistors in the right spots.
While I think the intent is to solder the pins in facing “down” and mount it in a socket - I like to solder mine with the pins facing up. This lets me wire-wrap right to the board:
If you get pins that are long enough - you can still solder a few of the pins to attach the Orangutan to another board. Or, you can just use mounting tape to hold it down.
Don’t underestimate the value of the motor drivers - they’re not just for motors!
I’ve used them to pulse high-wattage infrared LED’s and even drive a speaker.
To program the board you’ll need Pololu’s Orangutan USB Programmer or Atmel’s own programmer.
Yes, you might be able to put these components together yourself for a little less money - but how big would it be when you finished? How much time would you have to spend to wire it up?
For most small robotics projects the Baby Orangutan is a logical starting point. Pololu’s other Orangutan models are worth looking at for more advanced projects.
Published by rich on
Saturday, July 12, 2008 - 20:10:51
- Filed under Other Fun Stuff
I’ve been spending about $80 / month on water - a lot for a single guy.
I attribute this mostly to my long showers.
I spend a lot of time contemplating the SpamButcher anti-spam email system while in the shower. You could say I do some of my best work there.
I speculate that I’m spending about $64 each month on showers alone.
As part of my recent crackdown on spending - I wanted to see if I could do anything about this.
I already had installed an adjustable water restrictor on my existing 2 gallon per minute (GPM) showerhead. You can get one of these at the local hardware store for about $5.
I had it restricted back to only about 1.8 GPM. If I restricted it any further - it just didn’t feel satisfying.
(You can easily measure how many gallons per minute you’re using by timing how long it takes to full up a container of known volume)
So - I went to Home Depot and picked Delta Amplifying Shower Head for $12.75.
The packaging claimed it produced a shower that felt like 2.5 GPM while only using 1.6 GPM of water.
To my surprise - it works exactly as advertised!
While the head looks like it will just shoot a straight jet - it actually produces a nice pulsing widely dispersed stream - like a heavy rain.
In fact - I’m able to crank my restrictor down to 1 GPM and still get a fully satisfying shower.
If my guestimates are correct I’ll be:
- Using 44% less water for showers
- Using 35% less water total
- Saving about $28 a month
So this new shower head will pay for itself in about 2 weeks (3 weeks if you count the cost of the restrictor). That’s a pretty good return on investment.
In other money-saving news - I recently located the Quicken Starter Edition 2008 free trial, the Quicken Deluxe 2008 free trial, the Quicken Premier 2008 free trial, and the Quicken Home & Business 2008 free trial despite Intuit’s best efforts to hide them.